Cell Communication - Mrs. Waterworth's AP Biology
Chapter 11 – Cell Communication – Homework
1. Identify and describe the three stages of cell signaling.
2. Discuss what determines whether a cell is a target cell for a particular signal molecule.
3. Explain why most signals cannot cross the cell membrane and discuss the similarity between
these reasons and why molecules need active transport mechanisms.
4. Identify which receptor mechanism is especially good for triggering several pathways at
once. Explain how this mechanism can activate several different pathways.
5. Compare the function of a protein kinase to a protein phosphatase. How are they similar
and/or different?
6. Describe what is a phosphorylation cascade.
7. Discuss what properties molecules that function as secondary messengers have in common.
8. Discuss for an AP Biology exam reader why cell signaling is an important component of a
organism’s life.
9. Discuss for an AP Biology exam reader several examples or reasons why apoptosis is
necessary and even useful.
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